Author Zadie Smith says her new novel is to feature many young black men - characters conspicuous by their absence from her first book, White Teeth.

Smith, who is of Caribbean origin, told BBC World Service's World Book Club programme the absence of black men in her hugely-acclaimed and popular debut novel had been noticeable - in particular because of the wide-ranging number of people from many ethnic backgrounds.

Among the characters in White Teeth were Samad Iqbal, an elderly immigrant from Bangladesh, and Irie - a young mixed race schoolgirl.

Meanwhile the central character of the follow-up, The Autograph Man, was a half-Chinese, half-Jewish professional autograph hunter.

"What is true is there are no black young men in White Teeth at all," Smith said.

"Maybe partly in that case, of all the experiences that are radically different from my own. Being a young black man would be so different it would be quite hard to imagine."

Hip-hop language

The book I'm writing now has several young black men in it, some of them American, and I'm really enjoying it

Zadie Smith

Smith said one of the difficulties of writing about the experiences of young black men was that they dealt with extremes of prejudice.

"I guess all of us would find it difficult to imagine what it's like for people to cross the street to avoid you. That's not a normal experience," she said.

"It's certainly one my brothers have had - I've never had that, people don't cross the street to avoid girls.

"So I do find it quite tough."

But she also stressed that her new, as yet untitled book would be tackling these characters.

"The book I'm writing now has several young black men in it, some of them American, and I'm really enjoying it," she added.

"Particularly the language part - some of the pidgin languages that have come up in the black male community, through hip-hop and other forms, are so elaborate, and so different from what you consider standard English, that it's a real challenge to try and convey them."